Online cleaning device for multi-stage turbine impeller

Abstract

The invention discloses a multistage turbine impeller online cleaning device, and relates to the technical field of turbine impellers, the multistage turbine impeller online cleaning device comprises a water tank and cleaning assemblies, the cleaning assemblies are symmetrically arranged on one side of the water tank, each cleaning assembly comprises a sleeve, and the sleeves are symmetrically arranged on one side of the water tank. When the turbine cleaning device is used, the interior of the turbine can be cleaned without disassembling the turbine, the spraying angle of cleaning liquid can be automatically adjusted during cleaning, the cleaning range is expanded, the cleaning efficiency is guaranteed, the cleaning liquid can be recycled, the cleaning liquid is prevented from being left in the turbine, and in the using process of the turbine, the cleaning effect is good. Heat in compressed air can be utilized to heat cleaning liquid, air is purified, impurities are prevented from being discharged to the outside along with the air, the filter screen can be cleaned synchronously, blockage of the filter screen is avoided, the cleaning liquid can be mixed automatically when the cleaning liquid is supplemented, it is guaranteed that the cleaning liquid is evenly dispersed in the water tank, and the cleaning efficiency is improved. And meanwhile, balanced heating can be ensured.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of turbine impeller, in particular to a kind of multistage turbine impeller online cleaning device. BACKGROUND

[0002] Vacuum system is a very important component of paper machine. At present, the vacuum system of paper machine at home and abroad usually adopts multistage turbine vacuum machine. Multistage turbine vacuum machine generates vacuum degree by sucking gas, and the water in the paper pulp is taken away by the sucked gas to improve the dryness of paper for dewatering.

[0003] The turbine vacuum machine is provided with multiple impellers, the internal flow channel is complex, the impeller is closed, and the paper pulp fiber is contained in the sucked gas, which cannot be completely separated. In general, the turbine vacuum machine needs to be opened regularly for cleaning, which has certain influence on normal production. If not cleaned in time, the baffle (diffuser, refluxer) will be blocked, the normal gas conveying will be affected, and the paper pulp fiber will adhere to the surface of the impeller, which will damage the rotor dynamic balance and cause vibration. SUMMARY

[0004] The purpose of the present application is to provide a kind of multistage turbine impeller online cleaning device to solve the problems raised in the above background.

[0005] To achieve the above purpose, the present application provides the following technical scheme: a kind of multistage turbine impeller online cleaning device, including water tank and cleaning assembly, the water tank one side is symmetrically provided with cleaning assembly, the cleaning assembly includes sleeve, the water tank one side is symmetrically provided with sleeve, and connecting spring is connected in sleeve, one end of the connecting spring is connected with the communicating pipe, and the communicating pipe is rotatably connected with the spray pipe through the through shaft at one end, the communicating pipe is rotatably connected with the transmission wheel at one side, and the transmission wheel is connected with the cam plate at one side, the communicating pipe is symmetrically connected with the limit card at one end, and the limit card is connected with the limit frame between the limit card, the limit frame is provided with a limit slot on the surface, and the limit frame is connected with the limit block at one side, and the spray pipe is connected with the swing spring at one end.

[0006] Further, the communicating pipe is L-shaped, and the sleeve is sleeved on the longitudinal section of the communicating pipe, and the communicating pipe is elastically connected with the sleeve through the connecting spring.

[0007] Further, the spray pipe is slidably connected with the limit frame through the limit slot, and the limit frame is slidably connected with the communicating pipe through the limit card, the spray pipe is elastically connected with the communicating pipe through the swing spring, and the limit block is slidably connected with the cam plate.

[0008] Further, the water tank is connected with the circulating pump, and the water tank is provided with an air outlet on the upper wall, the circulating pump is connected with the water supply pipe at one side, and the water supply pipe is symmetrically connected with the water distribution pipe at one side, the water distribution pipe is connected with the sleeve, and the water distribution pipe and the sleeve are installed in the turbine.

[0009] Further, the lower part of the water tank is provided with a filter screen, and the upper part of the water tank is symmetrically provided with an auxiliary heater, and a blowdown pipe is arranged on the other side wall of the water tank.

[0010] Further, the lower part of the water tank is provided with a filter screen, and the upper part of the water tank is symmetrically provided with an auxiliary heater, and a blowdown pipe is arranged on the other side wall of the water tank.

[0011] Further, the other end of the air return pipe is provided with an agitation assembly, the agitation assembly comprises an air pipe, the other end of the air return pipe is connected with the air pipe, and the outer side of the air pipe is sleeved with a gas distribution disc, and the gas distribution disc rotates on the air return pipe through the air pipe.

[0012] Further, the agitation assembly further comprises an air outlet pipe, the air outlet pipe is connected with the side of the gas distribution disc, the air outlet pipes are equally distributed on the gas distribution disc, and the end of the air outlet pipe away from the gas distribution disc is a bend.

[0013] Further, the agitation assembly further comprises a rotating disc, the rotating disc is connected with one side of the gas distribution disc, and the rotating disc is symmetrically connected with a scraper around, and the side of the scraper away from the rotating disc is symmetrically provided with a sliding groove, and the scraper is in the shape of a concave.

[0014] Further, the agitation assembly further comprises a tension spring, the tension spring is symmetrically connected with the middle part of the scraper, and the other end of the tension spring is connected with a scraping strip, the scraping strip is symmetrically connected with a sliding block on both sides, and the sliding block is slidably connected with the scraper through the sliding groove, and the scraping strip is elastically connected with the scraper through the tension spring.

[0015] The application provides a multi-stage turbine impeller online cleaning device, which has the following advantages: the turbine can be cleaned without being disassembled, the spray angle of the cleaning liquid can be automatically adjusted during cleaning, the cleaning range is expanded, the cleaning efficiency is ensured, the cleaning liquid can be recycled, the cleaning liquid can be prevented from remaining in the turbine, the heat in the compressed air can be used to heat the cleaning liquid during the use of the turbine, the air can be purified to prevent impurities from being discharged to the outside with the air, the filter screen can be cleaned synchronously to prevent the filter screen from being blocked, the cleaning liquid can be automatically mixed when the cleaning liquid is supplemented, the cleaning liquid can be uniformly distributed in the water tank, and the cleaning liquid can be uniformly heated.

[0016] 1、The turbine is not necessary to be disassembled to clean the inside, and the spray angle of the cleaning liquid can be adjusted by the power of the turbine itself without external power input, the spray pipe swings repeatedly in the turbine to expand the cleaning range and ensure the cleaning efficiency, the driving wheel and the shaft rod are not in contact when not cleaning to reduce the abrasion of the driving wheel and the shaft rod and prolong the service life of the device.

[0017] 2、The cleaning liquid can be recycled and avoided to remain in the turbine, and the cleaning liquid can be mixed automatically during the cleaning process and when adding the cleaning liquid to ensure the uniform distribution of the cleaning liquid in the water tank and the cleaning effect of the cleaning liquid, and the uneven distribution of the cleaning liquid is avoided to reduce the cleaning effect.

[0018] 3、The cleaning liquid can be heated by the heat of the compressed air to achieve the effect of heat recovery and reduce energy waste, the compressed air can be purified to avoid impurities being discharged to the outside with the air, and the air can be dispersed to ensure the cleaning effect and heating effect when stirring the cleaning liquid, and the filter screen can be cleaned to avoid the filter screen being blocked to cause the cleaning liquid to circulate normally. DETAILED DESCRIPTION

[0019] Fig. 1 It is a whole three-dimensional structure schematic view of the online cleaning device for the multi-stage turbine impeller of the application; Fig. 2 It is a cleaning assembly half-section three-dimensional exploded structure schematic view of the online cleaning device for the multi-stage turbine impeller of the application; Fig. 3 It is a half-section three-dimensional structure schematic view of the online cleaning device for the multi-stage turbine impeller of the application; Fig. 4 It is a water tank half-section three-dimensional exploded structure schematic view of the online cleaning device for the multi-stage turbine impeller of the application; Fig. 5 It is a gas distribution disc half-section three-dimensional exploded structure schematic view of the online cleaning device for the multi-stage turbine impeller of the application; Fig. 6 It is a gas distribution disc overhead structure schematic view of the online cleaning device for the multi-stage turbine impeller of the application.

[0020] In the figure: 1, water tank; 2, cleaning assembly; 201, sleeve; 202, connecting spring; 203, communication pipe; 204, spray pipe; 205, transmission wheel; 206, cam plate; 207, limit card; 208, limit frame; 209, limit slot; 210, limit block; 211, swing spring; 3, circulating pump; 4, air outlet; 5, water supply pipe; 6, water distribution pipe; 7, filter screen; 8, auxiliary heater; 9, sewage pipe; 10, air return pipe; 11, water return tray; 12, air return cover; 13, control valve; 14, check valve; 15, stirring assembly; 1501, air pipe; 1502, gas distribution disc; 1503, air outlet pipe; 1504, rotating disc; 1505, scraper; 1506, sliding groove; 1507, tension spring; 1508, scraper strip; 1509, sliding block. DETAILED DESCRIPTION

[0021] Referring to Figs. 1 to 6 The application provides the technical scheme: a multistage turbine impeller online cleaning device, which comprises a water tank 1 and a cleaning assembly 2, the water tank 1 is symmetrically provided with the cleaning assembly 2 on one side, the cleaning assembly 2 comprises a sleeve 201, the water tank 1 is symmetrically provided with the sleeve 201 on one side, and the sleeve 201 is connected with a connecting spring 202, one end of the connecting spring 202 is connected with a communication pipe 203, one end of the communication pipe 203 is rotationally connected with a spray pipe 204 through a through shaft, one side of the communication pipe 203 is rotationally connected with a transmission wheel 205, one side of the transmission wheel 205 is connected with a cam plate 206, one end of the communication pipe 203 is symmetrically connected with limit cards 207, the limit cards 207 are clamped and connected with a limit frame 208, the limit frame 208 is provided with a limit slot 209 on the surface, one side of the limit frame 208 is connected with a limit block 210, and one end of the spray pipe 204 is connected with a swing spring 211.

[0022] Referring to Figs. 1 to 4The communication pipe 203 is L-shaped, the sleeve 201 is sleeved on the longitudinal section of the communication pipe 203, the communication pipe 203 is elastically connected with the sleeve 201 through the connecting spring 202, the spray pipe 204 is slidingly connected with the limiting frame 208 through the limiting slot 209, the limiting frame 208 is slidingly connected with the communication pipe 203 through the limiting clamping 207, the spray pipe 204 is elastically connected with the communication pipe 203 through the swing spring 211, the limiting block 210 is slidingly connected with the cam plate 206 in a clamping mode, the water tank 1 is connected with the circulating pump 3, a gas outlet 4 is formed in the upper portion of the side wall of the water tank 1, the circulating pump 3 is connected with the water supply pipe 5 on one side, the water supply pipe 5 is symmetrically connected with the water distribution pipe 6 on one side, the water distribution pipe 6 is connected with the sleeve 201, and the water distribution pipe 6 and the sleeve 201 are installed in the turbine, a filter screen 7 is arranged in the lower portion of the water tank 1, auxiliary heaters 8 are symmetrically arranged in the upper portion of the water tank 1, a blowdown pipe 9 is arranged on the other side wall of the water tank 1, a gas return pipe 10 is connected with the water tank 1, a water return disc 11 is connected with the gas return pipe 10 through a pipeline, a gas return cover 12 is connected with one end of the gas return pipe 10, a control valve 13 is connected with one side of the water return disc 11, and a one-way valve 14 is connected with the other side of the water return disc 11. Specific operation is as follows, when in use, the inside of the turbine can be cleaned without disassembling the turbine, when cleaning the inside of the turbine, the spray angle of the cleaning liquid can be adjusted by the power of the turbine itself without external power input, the spray pipe 204 repeatedly swings in the turbine to expand the cleaning range and ensure the cleaning efficiency, the transmission wheel 205 and the shaft rod are disconnected to reduce the wear of the transmission wheel 205 and the shaft rod and prolong the service life of the device, the cleaning liquid can be recycled during cleaning, the cleaning liquid is prevented from remaining in the turbine, the cleaning liquid is automatically mixed during the cleaning process and when the cleaning liquid is added, the cleaning liquid is uniformly distributed in the water tank 1 to ensure the cleaning effect of the cleaning liquid and prevent the cleaning effect from being reduced due to uneven distribution of the cleaning liquid.

[0023] Please refer to Figs. 5 to 6The other end of the return air pipe 10 is provided with an agitating assembly 15, the agitating assembly 15 comprises a vent pipe 1501, the other end of the return air pipe 10 is connected with the vent pipe 1501, and the vent pipe 1501 is sleeved with a gas distribution disc 1502 outside, the gas distribution disc 1502 rotates on the return air pipe 10 through the vent pipe 1501, the agitating assembly 15 further comprises a gas outlet pipe 1503, the gas outlet pipe 1503 is connected with the gas distribution disc 1502 on the side, the gas outlet pipe 1503 is distributed equidistantly on the gas distribution disc 1502, and the end, away from the gas distribution disc 1502, of the gas outlet pipe 1503 is a bend, the agitating assembly 15 further comprises a rotating disc 1504, the rotating disc 1504 is connected with the gas distribution disc 1502 on one side, and the rotating disc 1504 is symmetrically connected with scrapers 1505 around, the side, away from the rotating disc 1504, of the scraper 1505 is symmetrically provided with a sliding groove 1506, the scraper 1505 is in the shape of a concave letter, the agitating assembly 15 further comprises a tension spring 1507, the tension spring 1507 is symmetrically connected with the scraper 1505 in the middle part, and the other end of the tension spring 1507 is connected with a scraper strip 1508, the scraper strip 1508 is symmetrically connected with sliding blocks 1509 on both sides, and the sliding blocks 1509 are slidably connected with the scraper 1505 through the sliding groove 1506, and the scraper strip 1508 is elastically connected with the scraper 1505 through the tension spring 1507; Specific operation is as follows, when not washing, the heat in compressed air can be used to heat the cleaning liquid, achieving the effect of heat recovery, reducing energy waste, at the same time, the compressed air can be purified, avoiding impurities being discharged to the outside with air, and when stirring the cleaning liquid, air can be dispersed, ensuring cleaning effect and heating effect, and the filter screen 7 can be cleaned synchronously, avoiding the filter screen 7 being blocked, causing the cleaning liquid to be unable to circulate normally.

[0024] In conclusion, the multi-stage turbine impeller online cleaning device is used as follows, firstly, the sleeve 201 and the water distribution pipe 6 are fixed in the turbine, then the turbine is assembled, and the water return disc 11 and the air return cover 12 are installed on the turbine, when the turbine is running, the gas carrying impurities enters the turbine, then enters the return air pipe 10 through the air return cover 12, then passes through the vent pipe 1501, and is dispersed into the cleaning liquid in the water tank 1 from the gas distribution disc 1502 through the gas outlet pipe 1503, and then leaves the water tank 1 from the gas outlet 4, the cleaning liquid can remove the impurities mixed in the gas, avoiding the impurities directly entering the external environment, and the heat of the compressed gas can heat the cleaning liquid, reducing the temperature difference between the cleaning liquid and the inside of the turbine, reducing the thermal stress of the inside of the turbine during cleaning, if the temperature of the cleaning liquid before cleaning does not reach the cleaning standard, the auxiliary heater 8 is started to assist heating the cleaning liquid until the cleaning liquid reaches the set temperature, and the filter screen 7 can avoid the impurities moving to the upper part of the water tank 1 and entering the circulating pump 3 with the cleaning liquid, causing the circulating pump 3 to be damaged; When the gas exits from the outlet pipe 1503, the counter thrust of the gas can make the outlet pipe 1503 drive the gas distribution disc 1502 to rotate on the air pipe 1501, so that the outlet pipe 1503 stirs the cleaning liquid and uniformly spreads the gas into the cleaning liquid, uniformly heats the cleaning liquid, and when the cleaning liquid is added, the stirring of the outlet pipe 1503 on the cleaning liquid can also accelerate the mixing of the cleaning liquid, and the impurities below the filter screen 7 can be removed by opening the drain pipe 9 every time interval; When the gas distribution disc 1502 rotates, the rotating disc 1504 can rotate with the gas distribution disc 1502, so as to drive the scraper 1505 and the scraping strip 1508 to clean the lower surface of the filter screen 7, so as to avoid the accumulation of impurities on the filter screen 7 to cause the filter screen 7 to be blocked, and the extension spring 1507 can make the scraping strip 1508 always press on the inner wall of the water tank 1, so as to ensure that the scraper 1505 and the scraping strip 1508 can clean the filter screen 7 without dead angle, and the sliding block 1509 can limit the scraping strip 1508 through the sliding groove 1506, so as to avoid the scraping strip 1508 from being deflected when moving on the scraper 1505, and ensure the cleaning effect of the scraping strip 1508; When the turbine needs to be cleaned, the circulating pump 3 is started to pump the heated cleaning liquid in the water tank 1 into the water feeding pipe 5, and then into the communication pipe 203 through the water distribution pipe 6 from each sleeve 201, and then sprayed out from the spray pipe 204 to flush the impeller and inner wall of the turbine, and under the action of water pressure, the communication pipe 203 drives the transmission wheel 205 to approach the shaft of the turbine and compresses the connecting spring 202, the sleeve 201 can limit the communication pipe 203 to avoid deflection during movement, after the transmission wheel 205 contacts the shaft, the cam plate 206 can be driven to rotate with the shaft, and then the limiting frame 208 is driven to move between the limiting clamps 207 through the limiting block 210, and the spray pipe 204 is driven to rotate on the communication pipe 203 through the sliding groove 1506 to adjust the spray angle of the spray pipe 204, the limiting clamps 207 can limit the limiting frame 208 to avoid deflection during movement, and when the spray pipe 204 rotates, the swing spring 211 can be stretched, so that the spray pipe 204 can press the limiting frame 208 through the sliding groove 1506, so that the limiting block 210 tightly adheres to the cam plate 206, and then the cam plate 206 can drive the spray pipe 204 to repeatedly swing on the communication pipe 203, so as to expand the spray range of the cleaning liquid and ensure the comprehensiveness of cleaning; When the turbine is cleaned, the control valve 13 in the water return tray 11 is opened synchronously with the circulating pump 3, and as the turbine operates, most of the cleaning liquid is extracted with the airflow, enters the air return pipe 10 from the air return cover 12, and the remaining cleaning liquid in the turbine can enter the water return tray 11 from the control valve 13, and as the air flows in the air return pipe 10, a pressure difference can be formed at the one-way valve 14 to suck the cleaning liquid in the water return tray 11 into the air return pipe 10, the one-way valve 14 can prevent the air from carrying the remaining cleaning liquid back to the turbine from the control valve 13, and avoid the cleaning liquid remaining in the turbine, and the cleaning liquid enters the air return pipe 10 and can be used in the water tank 1 with the airflow; After the cleaning is completed, the water pump is closed, no subsequent cleaning liquid is injected into the connecting pipe 203, the connecting pipe 203 can be reset under the action of the connecting spring 202, and the excess cleaning liquid can be squeezed out from the spray pipe 204, at this time the transmission wheel 205 is separated from the shaft under the reset of the connecting pipe 203, reducing the wear of the transmission wheel 205 and the shaft, avoiding the transmission wheel 205 still driving the spray pipe 204 to swing when the turbine is normally used, and after the residual cleaning liquid completely enters the air return pipe 10, the control valve 13 is closed, which can avoid the air directly entering the air return pipe 10 from the water return tray 11 during the use of the turbine, resulting in a decrease in the compression degree of the gas, and in turn resulting in a decrease in the temperature of the gas.

[0025] It should be noted that in this paper, the terms "include", "contain" or any other variants thereof are intended to cover non-exclusive inclusion, so that the process, method, article or equipment including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such process, method, article or equipment.

[0026] The principles and embodiments of the present application are described in this paper, and the above examples are only used to help understand the method and core idea of the present application. The above description is only the preferred embodiment of the present application, and it should be pointed out that due to the limitation of language expression, there are infinite specific structures, and for ordinary skilled persons in the technical field, some improvements, decorations or changes can be made without departing from the principles of the present application, and the above technical features can be combined in a proper way; these improvements, decorations, changes or combinations, or the application of the inventive concept and technical scheme to other fields without improvement, shall be regarded as the protection scope of the present application.

Claims

1. An online cleaning device for multi-stage turbine impellers, characterized in that, Includes a water tank (1) and a cleaning assembly (2). The cleaning assembly (2) is symmetrically arranged on one side of the water tank (1). The cleaning assembly (2) includes a sleeve (201). The sleeve (201) is symmetrically arranged on one side of the water tank (1), and a connecting spring (202) is connected inside the sleeve (201). The other end of the connecting spring (202) is connected to a connecting pipe (203), and one end of the connecting pipe (203) is rotatably connected to a spray pipe (204) via a through shaft. 3) A drive wheel (205) is rotatably connected on one side, and a cam plate (206) is connected on one side of the drive wheel (205). One end of the connecting pipe (203) is symmetrically connected to a limit card (207), and a limit frame (208) is engaged between the limit cards (207). A limit groove (209) is opened on the surface of the limit frame (208), and a limit block (210) is connected on one side of the limit frame (208). One end of the nozzle (204) is connected to a swing spring (211).

2. The online cleaning device for multi-stage turbine impellers according to claim 1, characterized in that, The connecting pipe (203) is L-shaped, and the sleeve (201) is fitted onto the longitudinal section of the connecting pipe (203). The connecting pipe (203) is elastically connected to the sleeve (201) through a connecting spring (202).

3. The online cleaning device for multi-stage turbine impellers according to claim 1, characterized in that, The nozzle (204) is slidably connected to the limiting frame (208) through the limiting groove (209), and the limiting frame (208) is slidably connected to the connecting pipe (203) through the limiting card (207). The nozzle (204) is elastically connected to the connecting pipe (203) through the swing spring (211), and the limiting block (210) is engaged and slidably connected to the cam plate (206).

4. The online cleaning device for multi-stage turbine impellers according to claim 1, characterized in that, A circulation pump (3) is connected above the water tank (1), and an air outlet (4) is opened on the upper part of the side wall of the water tank (1). A water supply pipe (5) is connected to one side of the circulation pump (3), and a water distribution pipe (6) is symmetrically connected to one side of the water supply pipe (5). The water distribution pipe (6) is connected to the sleeve (201), and both the water distribution pipe (6) and the sleeve (201) are installed inside the turbine.

5. The online cleaning device for multi-stage turbine impellers according to claim 1, characterized in that, A filter screen (7) is provided in the lower part of the water tank (1), and an auxiliary heater (8) is symmetrically provided in the upper part of the water tank (1). A drain pipe (9) is provided on the other side wall of the water tank (1).

6. The online cleaning device for multi-stage turbine impellers according to claim 1, characterized in that, The lower part of the side wall of the water tank (1) is connected to a return air pipe (10), and a return water tray (11) is connected to the return air pipe (10) through a pipe. One end of the return air pipe (10) is connected to a return air cover (12). A control valve (13) is connected to one side of the return water tray (11), and a one-way valve (14) is connected to the other side of the return water tray (11).

7. The online cleaning device for multi-stage turbine impellers according to claim 6, characterized in that, The other end of the return air pipe (10) is provided with an agitation component (15), the agitation component (15) includes an air vent (1501), the other end of the return air pipe (10) is connected to the air vent (1501), and an air distribution plate (1502) is sleeved on the outside of the air vent (1501). The air distribution plate (1502) rotates on the return air pipe (10) through the air vent (1501).

8. The online cleaning device for multi-stage turbine impellers according to claim 7, characterized in that, The stirring assembly (15) also includes an air outlet pipe (1503). The air outlet pipe (1503) is connected to the side of the air distribution plate (1502). The air outlet pipe (1503) is equidistantly distributed on the air distribution plate (1502). The end of the air outlet pipe (1503) away from the air distribution plate (1502) is a bend.

9. The online cleaning device for multi-stage turbine impellers according to claim 8, characterized in that, The stirring assembly (15) also includes a turntable (1504). The turntable (1504) is connected to one side of the gas distribution plate (1502), and scrapers (1505) are symmetrically connected around the turntable (1504). The scrapers (1505) have symmetrical grooves (1506) on the side away from the turntable (1504), and the scrapers (1505) are U-shaped.

10. The online cleaning device for a multi-stage turbine impeller according to claim 9, characterized in that, The stirring assembly (15) further includes a tension spring (1507). The tension spring (1507) is symmetrically connected to the middle of the scraper (1505), and a scraper strip (1508) is connected to the other end of the tension spring (1507). Slider blocks (1509) are symmetrically connected to both sides of the scraper strip (1508), and the sliders (1509) are engaged and slidably connected to the scraper (1505) through the slide groove (1506). The scraper strip (1508) is elastically connected to the scraper (1505) through the tension spring (1507).

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